EP2582036B1 - Parameterschätzvorrichtung für ein Antriebssystem eines Permanentmagnetsynchronmotors - Google Patents

Parameterschätzvorrichtung für ein Antriebssystem eines Permanentmagnetsynchronmotors Download PDF

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EP2582036B1
EP2582036B1 EP12184942.6A EP12184942A EP2582036B1 EP 2582036 B1 EP2582036 B1 EP 2582036B1 EP 12184942 A EP12184942 A EP 12184942A EP 2582036 B1 EP2582036 B1 EP 2582036B1
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Prior art keywords
unit
estimating
output
reference frame
magnetic flux
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French (fr)
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EP2582036A2 (de
EP2582036A3 (de
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An No Yoo
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LS Electric Co Ltd
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LSIS Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • H02P21/16—Estimation of constants, e.g. the rotor time constant

Definitions

  • the present disclosure relates to parameter estimation, and more particularly to a parameter estimating apparatus for permanent magnet synchronous motor driving system.
  • PMSMs Permanent magnet synchronous machines driven by voltage inverters are generally operated under a speed control mode or a torque control mode.
  • the PMSMs used for the speed control mode may include such industrial fields as hoist fields including elevators and cranes, and variable speed operation fields including fans and pumps.
  • the PMSMs used for the torque control mode may include such industrial fields as traction motors for electric vehicles.
  • FIG.1 is a schematic diagram illustrating a PMSM according to prior art, where a PMSM driving system is illustrated that is driven by an inverter in which a vector control independently controlling a magnetic flux current and a torque current is realized.
  • the PMSM driving system includes an inverter (100), a PMSM (200) and a rotor position detector (210).
  • the inverter (100) receives a reference torque to output voltages for driving the PMSM (200) in response to the reference torque.
  • the rotor of the PMSM (200) is attached with the rotor position detector (210) to calculate or measure rotor position and rotor velocity.
  • the rotor position and rotor velocity calculated or measured by the rotor position detector (210) is used for coordination conversion by coordinate converters (130, 170).
  • a current command generator (110) outputs a current command of synchronous reference frame.
  • a current controller (120) serving to control the current command, outputs d/q axis voltage of the synchronous reference frame.
  • a coordinate converter (130) uses the rotor position information received from the rotor position detector (210) to convert an output voltage of the current controller (120) to a voltage of a stationary reference frame.
  • An over-modulator (140) functions to convert the output voltage of the coordinate converter (130) to a voltage that can be combined by an inverter unit (150).
  • the inverter unit (150) is a voltage type inverter including a power semiconductor, and applies command torque-tracing voltages to the PMSM (200).
  • Current sensors (161 to 163) measure a phase current between the PMSM (200) and the inverter unit (150), and the current measured by the current sensors (161 to 163) is coordinate-converted by the coordinate converter (170) and fedback to the current controller (120).
  • an superscript 'r' represents a parameter of a synchronous reference frame
  • a subscript 's' is a parameter of stationary reference frame
  • P represents the number of poles of a motor
  • ⁇ ds r ⁇ qs r are rotor magnetic fluxes of d/q axis synchronous reference frame on the stationary reference frame
  • i ds r , i qs r are currents of d/q axis stationary reference frame on the synchronous reference frame
  • magnetic flux of rotor on d/q axis the synchronous reference frame may be defined by the following Equations:
  • the torque of the PMSM (200) is influenced by the d/q axis inductance and the magnet flux linkage of the permanent magnet,
  • a command generator (110) generates d/q axis current command on synchronous reference frame using relation between command torque and Equation 4.
  • a voltage equation of the synchronous reference frame of the PMSM (200) may be obtained by the following Equations.
  • V ds r R s i ds r + L ds d i ds r dt ⁇ ⁇ r ⁇ qs r
  • V qs r R s i qs r + L qs d i qs r dt + ⁇ r ⁇ ds r
  • ⁇ r is an electrical angle velocity
  • V ds r and V qs r are d/q axis voltage on the synchronous reference frame
  • R s is a phase resistance on the synchronous reference frame.
  • the current command generated by the current command generator (110) and feedback current of the coordinate converter (170) are inputted to the current controller (120).
  • the current controller (120) is a proportional and integral regulator, and combines an output voltage in the following manners.
  • V ds r * K pd + K id s i ds _ ref r ⁇ i ds r ⁇ ⁇ r ⁇ ⁇ qs r
  • V qs r * K pq + K iq s i qs _ ref r ⁇ i qs r + ⁇ r ⁇ ⁇ ds r
  • ⁇ ⁇ ds r and ⁇ ⁇ qs r are d/q axis magnetic flux estimated on the synchronous reference frame.
  • the over-modulator (140) regulates the voltage of the coordinate converter (130) and outputs the regulated voltage so that a voltage command can be available within an inscribed circle of voltage restriction condition expressed in a hexagon on the stationary reference frame.
  • the inverter unit (150) combines the following voltages from the output voltage of the over-modulator (140) and applies the voltage to the PMSM (200).
  • the current sensors (161 ⁇ 163) measure a phase current between the inverter unit (150) and the PMSM (200), convert the phase current to a current on the synchronous reference frame, and feedback the current to the current controller (120).
  • i ds s 2 i as ⁇ i bs ⁇ i cs 3
  • i qs s i bs ⁇ i cs 2
  • the PMSM (200) is saturated in magnetic flux according to load condition to generate a difference between the torque to be outputted by the inverter (100) and the actually outputted torque, the explanation of which has been described above.
  • the driving of the PMSM (200) as in FIG. 1 is problematic in that performance decreases in terms of torque control, if inductance of the PMSM (200) or magnetic flux linkage by the permanent magnet is saturated according to load condition, because the d/q axis current command on the synchronous reference frame is calculated by the torque command.
  • Document JP 2010 088238 A discloses a prior art synchronous motor controller for matching a torque command and an output torque.
  • embodiments of the present disclosure may relate to a parameter estimating apparatus for permanent magnet synchronous motor driving system that may substantially obviate one or more of the above disadvantages due to limitations and disadvantages of related art, and it is therefore an object of the present disclosure to provide a parameter estimating apparatus for permanent magnet synchronous motor driving system configured to estimate a magnetic flux linkage by inductance and a permanent magnet through a real time flux estimation, whereby a PMSM driving performance can be enhanced.
  • a parameter estimating apparatus for permanent magnet synchronous motor driving system including a current command generating unit generating a current command on a synchronous reference frame from a torque command, a current controller generating a voltage on the synchronous reference frame using a rotor position of a PMSM (Permanent Magnet Synchronous Machine) from the current command, a first coordinate converter converting an output of the current controller on the synchronous reference frame to an output on stationary reference frame, an over-modulator limiting the output of the first coordinate converter to within a predetermined range and outputting the limited output, an inverter unit applying a voltage command tracing the command torque to the PMSM, and a second coordinate converter converting a phase current outputted from the inverter unit on the stationary reference frame to a phase current on the synchronous reference frame, the apparatus comprising: a first estimating unit estimating a d-axis magnetic flux and a q-axis magnetic flux on a synchronous reference frame, using the output voltage
  • the second estimating unit comprises a first determining unit determining the q-axis inductance from the q-axis magnetic flux estimated by the first estimating unit, a first compensating unit compensating a difference between the first determining unit and a first adding unit using any one of a proportional gain and a proportional and integral gain, a first integrating unit integrating an output of the first compensating unit, and the first adding unit adding an output of the first integrating unit to an initially-set q-axis inductance.
  • the second estimating unit further comprises a first limiting unit limiting an output of the first adding unit to within predetermined maximum and minimum value.
  • the third estimating unit comprises a second determining unit determining the d-axis inductance from the d-axis magnetic flux estimated by the first estimating unit, a second compensating unit compensating a difference between the second determining unit and a second adding unit using any one of a proportional gain and a proportional integral gain, a second integrating unit integrating an output of the second compensating unit, and the second adding unit adding an output of the second integrating unit to the initially-set q-axis inductance.
  • the third estimating unit further comprises a second limiting unit limiting an output of the second adding unit to within predetermined maximum and minimum value.
  • the second determining unit is such that a magnet flux linkage is defined by a constant value.
  • a parameter estimating apparatus for permanent magnet synchronous motor driving system including a current command generating unit generating a current command on a synchronous reference frame from a torque command, a current controller generating a voltage on the synchronous reference frame using a rotor position of a PMSM from the current command, a first coordinate converter converting an output of the current controller on the synchronous reference frame to an output on stationary reference frame, an over-modulator limiting the output of the first coordinate converter to within a predetermined range and outputting the limited output, an inverter unit applying a voltage command tracing the command torque to the PMSM, and a second coordinate converter converting a phase current outputted from the inverter unit on the stationary reference frame to a phase current on the synchronous reference frame, the apparatus comprising: a first estimating unit estimating a d-axis magnetic flux and a q-axis magnetic flux on a synchronous reference frame, using the output voltage of the over-modulator, the phase current
  • the second estimating unit comprises a first determining unit determining the q-axis inductance from the q-axis magnetic flux estimated by the first estimating unit, a first compensating unit compensating a difference between the first determining unit and a first adding unit using any one of a proportional gain and a proportional integral gain, a first integrating unit integrating an output of the first compensating unit, and the first adding unit adding an output of the first integrating unit to an initially-set q-axis inductance.
  • the second estimating unit further comprises a first limiting unit limiting an output of the first adding unit to within predetermined maximum and minimum value.
  • the third estimating unit comprises a second determining unit determining the magnet flux linkage of the permanent magnet from the q-axis magnetic flux estimated by the first estimating unit, a second compensating unit compensating a difference between the second determining unit and a second adding unit, using any one of a proportional gain and a proportional integral gain, a second integrating unit integrating an output of the second compensating unit, and the second adding unit adding an output of the second integrating unit to the initially-set magnet flux linkage of the permanent magnet.
  • the third estimating unit further comprises a second limiting unit limiting an output of the second adding unit to within predetermined maximum and minimum value.
  • the second determining unit is such that a magnet flux linkage is defined by a constant value.
  • the parameter estimating apparatus for permanent magnet synchronous motor driving system has an advantageous effect in that a real time magnetic flux is estimated to estimate a magnet flux linkage of a permanent magnet, whereby an operation performance of the PMSM can be enhanced.
  • FIGS. 1-7 of the drawings like numerals being used for like and corresponding parts of the various drawings.
  • Other features and advantages of the disclosed embodiments will be or will become apparent to one of ordinary skill in the art upon examination of the following figures and detailed description. It is intended that all such additional features and advantages be included within the scope of the disclosed embodiments, and protected by the accompanying drawings.
  • the illustrated figures are only exemplary and not intended to assert or imply any limitation with regard to the environment, architecture, or process in which different embodiments may be implemented. Accordingly, the described aspect is intended to embrace all such alterations, modifications, and variations that fall within the scope and novel idea of the present invention.
  • first constituent element
  • second constituent element
  • exemplary is merely meant to mean an example, rather than the best. If is also to be appreciated that features, layers and/or elements depicted herein are illustrated with particular dimensions and/or orientations relative to one another for purposes of simplicity and ease of understanding, and that the actual dimensions and/or orientations may differ substantially from that illustrated.
  • the terms "-er”, “-or”, “part” and “module” described in the specification mean units for processing at least one function and operation and can be implemented by hardware components or software components, and combinations thereof.
  • FIG.2 is a structural view illustrating a PMSM driving system according to an exemplary embodiment of the present disclosure, where the PMSM driving system driven by an inverter including a parameter estimating apparatus is illustrated.
  • the PMSM driving system includes an inverter (10), a PMSM (20) and a rotor position detector (21).
  • the inverter (10) includes a current command generator (11), a current controller (12), a first coordinate converter (13), an over-modulator (14), an inverter unit (15), current sensors (16a to 16c), a second coordinate converter (17) and a parameter estimating unit (18).
  • the inverter (10) receives a reference torque to output voltages (V as , V bs , V cs ) for driving the PMSM (20) in response to the reference torque.
  • the rotor of the PMSM (20) is attached with the rotor position detector (21) to calculate or measure rotor position and rotor velocity.
  • the rotor position measured by the rotor position detector (21) is used for coordination conversion by the first and second coordinate converters (13, 17).
  • the current command generator (11) generates d/q axis current command on the synchronous reference frame from the reference torque, and updates an inductance from the parameter estimating unit (18) and magnet flux linkage information of a permanent magnet to generate d/q axis current command.
  • the current controller (12) controlling the current command outputted by the current command generator (11) outputs the d/q axis voltage on a synchronous reference frame.
  • the first coordinate converter (13) uses the rotor position information obtained by the rotor position detector (21) to convert the output voltage of the current controller (12) to a voltage on a stationary reference frame.
  • the over-modulator (14) converts the output voltage of the first coordinate converter (13) to a voltage combinable by the inverter unit (15).
  • the inverter unit (150) is preferably a voltage type inverter including a power semiconductor such as an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), and applies reference torque-tracing voltages (V as , V bs , V cs ) to the PMSM (20).
  • the current sensors (16a to 16c) measure a phase current of PMSM (20) between the PMSM (20) and the inverter unit (15), and the current measured by the current sensors (16a ⁇ 16c) is feedback to the current controller (12).
  • the second coordinate converter (17) converts the current on the stationary reference frame measured by the current sensors (16a to 16c) to current on the synchronous reference frame and transmits the current to the current controller (12).
  • the parameter estimating unit (18) receives the output voltage of the over-modulator (14), the phase current of the second coordinate converter (17) and rotor position detected by the rotor position detector (21) to estimate a magnetic flux used by the current controller (12), and estimates the d/q axis inductance estimated by the synchronous reference frame, the magnet flux linkage of the permanent magnet or the q-axis inductance by using the estimated magnetic flux, and transmits the estimation to the current command generator (11).
  • FIG.3 is a detailed structural view illustrating a parameter estimating apparatus of FIG.2 according to an exemplary embodiment of the present disclosure.
  • the parameter estimating unit (18) includes a magnetic flux estimating unit (31), a d-axis inductance estimating unit (32) and a q-axis inductance estimating unit (33).
  • the magnetic flux estimating unit (31) receives the output voltage of the over-modulator (14), the phase current of the second coordinate converter (17) and rotor position detected by the rotor position detector (21) to estimate a magnetic flux used by the current controller (12), and explanation of which will be provided in the following.
  • Equations 20 and 21 are outputted as final output voltages via the first coordinate converter (13) and the over-modulator (14) of FIG. 2 .
  • the output voltag of the current controller (12) generates only the coordinate voltage under a situation where no over-modulation is generated, the output voltage of the current controller (12) is same as each voltage expressed by the Equations 21 and 22, if the voltage combined by the inverter unit (15) is converted to that of synchronous reference frame.
  • Equation 22 An error of magnetic flux used by the current controller (12) can be obtained using the Equations 22 and 23.
  • the parameter estimating unit (18) can estimate d/q axis magnetic flux using the following Equations 26 and 27.
  • ⁇ ds _ est _ volt r ⁇ qs _ est _ volt r
  • ⁇ qs _ est _ cur r ⁇ ⁇ qs r
  • a d-axis inductance estimating unit (32) and a q-axis inductance estimating unit (33) estimate d/q-axis inductances respectively using the magnetic flux estimated by using Equations 26 and 27.
  • a magnet flux linkage of the permanent magnet is assumed as a constant value in the exemplary embodiment of the parameter estimating unit (18) of the present disclosure.
  • FIG.4 is a detailed structural view illustrating a d-axis inductance estimating unit (32) of FIG. 3 according to an exemplary embodiment of the present disclosure
  • FIG.5 is a detailed structural view illustrating a q-axis inductance estimating unit (33) of FIG. 3 according to an exemplary embodiment of the present disclosure.
  • the d/q axis inductance estimating units (32, 33) use the magnetic flux estimated by the magnetic flux estimating unit (31) to estimate d/q axis inductances respectively.
  • the d-axis inductance estimating unit (32) includes an Ld calculating unit (41), a compensating unit (42), an integrating unit (43), an adding unit (44) and a limiting unit (45), and the q-axis inductance estimating unit (33) includes an Lq calculating unit (51), a compensating unit (52), an integrating unit (53), an adding unit (54) and a limiting unit (55).
  • the Ld calculating unit (41) obtains a d-axis inductance from the d-axis magnetic flux (Equation 26) estimated by the magnetic flux estimating unit (31). At this time, the d-axis inductance can be obtained using Equation 2.
  • the compensating unit (42) compensates a difference between the Ld calculating unit (41) and the adding unit (44) using a proportional gain or a proportional and integral gain.
  • the integrating unit (43) integrates an output of the compensating unit (42), and the adding unit (44) combines an initially-set inductance and an output of the integrating unit (43).
  • the limiting unit (45) limits the estimated d-axis inductance to within a maximum value and a minimum value.
  • the Lq calculating unit (51) obtains a q-axis inductance from the q-axis magnetic flux (Equation 27) estimated by the magnetic flux estimating unit (31). At this time, the q-axis inductance can be obtained using Equation 1.
  • the compensating unit (52) compensates a difference between the Lq calculating unit (51) and the adding unit (54) using a proportional gain or a proportional and integral gain.
  • the integrating unit (53) integrates an output of the compensating unit (52), and the adding unit (54) combines an initially-set inductance and an output of the integrating unit (53).
  • the limiting unit (55) limits the estimated q-axis inductance to within a maximum value and a minimum value.
  • the parameter estimating unit(18) for the PMSM driving system uses the output voltage of the over-modulator (14), the phase current of the second coordinate converter (17) and rotor position of the rotor position detector (21) to estimate the magnetic flux of the current controller (12), through which the inductance can be obtained, whereby performance robust to parameter changes can be obtained, through which torque linearity can be guaranteed during torque control of the PMSM.
  • the parameter estimating unit (18) may also estimate the magnet flux linkage by the permanent magnet, using the d-axis inductance as a constant value.
  • FIG.6 is a detailed structural view illustrating a parameter estimating apparatus of FIG.2 according to another exemplary embodiment of the present disclosure.
  • the parameter estimating unit (18) includes a magnetic flux estimating unit (31), a magnet flux linkage estimating unit by a permanent magnet (illustrated as “magnet flux linkage estimating unit” in the figure, 34) and a q-axis inductance estimating unit (33).
  • the operation of the magnetic flux estimating unit (31) and the q-axis inductance estimating unit (33) has been already explained above, such that no more elaboration thereto will be provided as functions are identical.
  • FIG.7 is a detailed structural view illustrating the magnet flux linkage estimating unit (34) of permanent magnet of FIG.6 according to an exemplary embodiment of the present disclosure.
  • the magnet flux linkage estimating unit (34) of permanent magnet includes a ⁇ f calculating unit (71), a compensating unit (72), an integrating unit (73), an adding unit (74) and a limiting unit (75).
  • the ⁇ f calculating unit (71) obtains a magnet flux linkage ⁇ f by a permanent magnet from the d-axis magnetic flux (Equation 26) estimated by the magnetic flux estimating unit (31). At this time, the d-axis inductance can be obtained using Equation 2.
  • the compensating unit (73) compensates a difference between the ⁇ f calculating unit (71) and the adding unit (74) using a proportional gain or a proportional and integral gain.
  • the integrating unit (73) integrates an output of the compensating unit (72), and the adding unit (74) combines an initially-set inductance and an output of the integrating unit (73).
  • the limiting unit (75) limits the magnet flux linkage by the permanent magnet to within a maximum value and a minimum value.
  • the parameter estimating unit (18) can estimate the magnetic flux of the current controller (12) to show robustness to parameter changes, whereby the PMSM driving system according to the present disclosure can guarantee torque linearity.

Claims (10)

  1. Parameterschätzvorrichtung für ein Permanentmagnet-Synchronmotorantriebssystem, wobei die Vorrichtung eine Strombefehlserzeugungseinheit (11) aufweist, die aus einem Drehmomentbefehl einen Strombefehl an einem Synchronreferenzrahmen erzeugt, ein Stromregler (12) eine Spannung an dem Synchronreferenzrahmen unter Nutzung einer Rotorposition einer PMSM (Permanentmagnet-Synchronmaschine) aus dem Strombefehl erzeugt, ein erster Koordinatenwandler (13) einen Ausgang des Stromreglers auf dem synchronen Referenzrahmen zu einem Ausgang auf einem stationären Referenzrahmen umwandelt, ein Übermodulator (14) die Ausgabe des ersten Koordinatenwandlers innerhalb eines vorbestimmten Bereichs begrenzt und der begrenzten Ausgabe ausgibt, eine Wechselrichtereinheit (15) einen Spannungsbefehl anlegt, der das Befehlsdrehmoment zum PMSM verfolgt, und ein zweiter Koordinatenwandler (17) einen Phasenstrom umwandelt, der von der Wechselrichtereinheit an dem stationären Referenzrahmen an eine Phase an dem synchronen Referenzrahmen ausgegeben wird, gekennzeichnet durch: eine erste Schätzeinheit (31), die einen d-Achsen-Magnetfluss und einen q-Achsen-Magnetfluss an einem synchronen Referenzrahmen unter Nutzung der Ausgangsspannung des Übermodulators (14), des Phasenstroms vom zweiten Koordinatenwandler (17) und der Rotorposition abschätzt; eine zweite Schätzeinheit (33), die eine q-Achsen-Induktivität an dem synchronen Referenzrahmen unter Nutzung des q-Achsen-Magnetflusses von der ersten Schätzeinheit (31) abschätzt; und eine dritte Schätzeinheit (32) zum Abschätzen einer d-Achsen-Induktivität an dem synchronen Referenzrahmen unter Nutzung des d-Achsen-Magnetflusses von der ersten Schätzeinheit, wobei ein Strombefehl unter Nutzung der Strombefehl-Erzeugungseinheit (11), der q-Achsen-Induktivität und der d-Achsen-Induktivität erzeugt wird, die von der zweiten und der dritten Schätzeinheit (33 und 32) abgeschätzt werden;
    wobei die zweite Schätzeinheit (33) eine erste Bestimmungseinheit (51) aufweist, die die q-Achsen-Induktivität aus dem durch die erste Schätzeinheit (31) geschätzten q-Achsen-Magnetfluss bestimmt, eine erste Kompensationseinheit (52) eine Differenz zwischen der ersten Bestimmungseinheit (51) und einer ersten Additionseinheit (54) unter Nutzung einer Proportionalverstärkung oder einer Proportional- und Integralverstärkung kompensiert, eine erste Integriereinheit (53) eine Ausgabe der ersten Kompensationseinheit (52) integriert, und die erste Addiereinheit (54) eine Ausgabe der ersten Integriereinheit (53) zu einer anfänglich eingestellten q-Achsen-Induktivität addiert.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die zweite Schätzeinheit (33) ferner eine erste Begrenzungseinheit (55) umfasst, die eine Ausgabe der ersten Addiereinheit (54) auf einen vorbestimmten maximalen und minimalen Wert begrenzt.
  3. Vorrichtung nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass die dritte Schätzeinheit (32) eine zweite Bestimmungseinheit (41) umfasst, die die d-Achsen-Induktivität aus dem von der ersten Schätzeinheit (31) abgeschätzten d-Achsen-Magnetfluss bestimmt, eine zweite Kompensationseinheit (42), die eine Differenz zwischen der zweiten Bestimmungseinheit (41) und einer zweiten Addiereinheit (44) unter Nutzung einer proportionalen Verstärkung und einer proportionalen Integralverstärkung kompensiert, eine zweite Integrationseinheit (43) eine Ausgabe der zweiten Kompensationseinheit (42) integriert, und die zweite Addiereinheit (44) eine Ausgabe der zweiten Integriereinheit (43) zu der anfänglich eingestellten q-Achsen-Induktivität addiert.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die dritte Schätzeinheit (32) ferner eine zweite Begrenzungseinheit (45) umfasst, die eine Ausgabe der zweiten Addiereinheit (44) auf einen vorbestimmten maximalen und minimalen Wert begrenzt.
  5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die zweite Bestimmungseinheit (41) derart ist, dass eine Magnetflussverkettung durch einen konstanten Wert definiert ist.
  6. Parameterschätzvorrichtung für ein Permanentmagnet-Synchronmotorantriebssystem, wobei die Vorrichtung eine Strombefehlserzeugungseinheit (11) aufweist, die aus einem Drehmomentbefehl einen Strombefehl an einem Synchronreferenzrahmen erzeugt, ein Stromregler (12) eine Spannung an dem Synchronreferenzrahmen unter Nutzung einer Rotorposition eines PMSM aus dem Strombefehl erzeugt, ein erster Koordinatenwandler (13) einen Ausgang des Stromreglers (12) auf dem synchronen Referenzrahmen zu einem Ausgang auf einem stationären Referenzrahmen umwandelt, ein Übermodulator (14) die Ausgabe des ersten Koordinatenwandlers (13) auf einen vorbestimmten Bereich begrenzt und die begrenzte Ausgabe ausgibt, eine Wechselrichtereinheit (15) einen Spannungsbefehl anlegt, der das Befehlsdrehmoment zu dem PMSM verfolgt, und ein zweiter Koordinatenwandler (17) einen Phasenstrom umwandelt, der von der Wechselrichtereinheit an dem stationären Referenzrahmen an einen Phasenstrom an dem Synchronreferenzrahmen ausgegeben wird, die Vorrichtung gekennzeichnet durch: eine erste Schätzeinheit zum Abschätzen (31) eines d-Achsen-Magnetflusses und eines q-Achsen-Magnetflusses an einem synchronen Referenzrahmen unter Verwendung der Ausgangsspannung des Übermodulators (14), des Phasenstroms von dem zweiten Koordinatenwandler (17) und die Rotorposition; eine zweite Schätzeinheit (33), die eine q-Achsen-Induktivität an dem synchronen Referenzrahmen unter Verwendung des q-Achsen-Magnetflusses von der ersten Schätzeinheit (31) schätzt; und eine dritte Schätzeinheit (34) zum Abschätzen einer Magnetflussverbindung eines Permanentmagneten unter Nutzung des d-Achsen-Magnetflusses von der ersten Schätzeinheit (31), wobei ein Strombefehl unter Nutzung der Strombefehlserzeugungseinheit (11) die q-Achsen-Induktivität und die Magnetfluss-Verknüpfung des Permanentmagneten von der zweiten und dritten Schätzeinheit (33 und 32) erzeugt wird;
    wobei die zweite Schätzeinheit (33) eine erste Bestimmungseinheit (51) aufweist, die die q-Achsen-Induktivität aus dem durch die erste Schätzeinheit (31) abgeschätzten q-Achsen-Magnetfluss bestimmt, eine erste Kompensationseinheit (52) eine Differenz zwischen der ersten Bestimmungseinheit (51) und einer ersten Addiereinheit (54) unter Nutzung einer Proportionalverstärkung oder einer Proportionalintegralverstärkung kompensiert, eine erste Integrationseinheit (53), die eine Ausgabe der ersten Kompensationseinheit (52) integriert, und die erste Integrationseinheit Addiereinheit (54) eine Ausgabe der ersten Integriereinheit (53) zu einer anfänglich eingestellten q-Achsen-Induktivität addiert.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die zweite Schätzeinheit (33) ferner eine erste Begrenzungseinheit (55) umfasst, die eine Ausgabe der ersten Addiereinheit (54) auf einen vorbestimmten maximalen und minimalen Wert begrenzt.
  8. Vorrichtung nach einem der Ansprüche 6 bis 7, dadurch gekennzeichnet, dass die dritte Schätzeinheit (34) eine zweite Bestimmungseinheit (71) beinhaltet, die die Magnetflussverkettung des Permanentmagneten von dem durch die erste Schätzung abgeschätzten q-Achsen-Magnetfluss, der durch die erste Schätzeinheit (31) abgeschätzt wurde, bestimmt, eine zweite Kompensationseinheit (72) eine Differenz zwischen der zweiten Bestimmungseinheit (71) und einer zweiten Addiereinheit (74) unter Nutzung einer Proportionalverstärkung und/oder einer proportionalen Integralverstärkung kompensiert, eine zweite Integrationseinheit (73) eine Ausgabe der zweiten Kompensationseinheit (72) integriert, und die zweite Addiereinheit (74) eine Ausgabe der zweiten Integriereinheit (73) zu der anfänglich eingestellten Magnetflussverkettung des Permanentmagneten addiert.
  9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die dritte Schätzeinheit (34) ferner eine zweite Begrenzungseinheit (75) umfasst, die eine Ausgabe der zweiten Addiereinheit (74) auf einen vorbestimmten maximalen und minimalen Wert begrenzt.
  10. Vorrichtung nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass die zweite Bestimmungseinheit (71) derart ist, dass eine Magnetflussverkettung durch einen konstanten Wert definiert ist.
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